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[ASan] Fix comments about __sanitizer_cov function 

llvm-svn: 213673
This commit is contained in:
Alexey Samsonov 2014-07-22 17:46:09 +00:00
parent 4339903c94
commit bad4d0c38a
1 changed files with 2 additions and 3 deletions
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5
llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -1311,8 +1311,7 @@ void AddressSanitizer::InjectCoverageAtBlock(Function &F, BasicBlock &BB) {
Cmp, IP, false, MDBuilder(*C).createBranchWeights(1, 100000));
IRB.SetInsertPoint(Ins);
IRB.SetCurrentDebugLocation(EntryLoc);
// We pass &F to __sanitizer_cov. We could avoid this and rely on
// GET_CALLER_PC, but having the PC of the first instruction is just nice.
// __sanitizer_cov gets the PC of the instruction using GET_CALLER_PC.
IRB.CreateCall(AsanCovFunction);
StoreInst *Store = IRB.CreateStore(ConstantInt::get(Int8Ty, 1), Guard);
Store->setAtomic(Monotonic);
@ -1324,7 +1323,7 @@ void AddressSanitizer::InjectCoverageAtBlock(Function &F, BasicBlock &BB) {
// as the function and inject this code into the entry block (-asan-coverage=1)
// or all blocks (-asan-coverage=2):
// if (*Guard) {
// __sanitizer_cov(&F);
// __sanitizer_cov();
// *Guard = 1;
// }
// The accesses to Guard are atomic. The rest of the logic is